Is it possible to control the arduino web content from another webserver? I think it should be but am struggling to find anything decent on the interwebs that provides any insight. I want to be able to send control commands from a Raspberry Pi web server to my arduino.

I'm expecting someone will come back and tell me this is a simple task and I'll feel like a real goose then.

I already have a Pi LAMP server on my network that I want to host the main home automation webpages. I have an EtherTen (with a relay 8 shield) controlling relays in another part of the house that is connected to my network (POE).

My aim is to serve up the webpages from my Pi, but essentially send the POST control to the EtherTen in order to activate the relays that can already be controlled the the EtherTen's own web page.